Confused?

I'm 87 days post c section. I got my period around 50 something days. It's been a month and I'm already late. I got my period for two weeks, so I'm guessing it's that. However I keep getting cramp pains but no period yet! :( I'm also pumping milk but I do it roughly 4 to 3 times a day. I am having sex but was on the pill. Is it normal?